Olympus OM-D E-M1 Mark II - Continuous Auto-focusing
The Olympus OM-D E-M1 Mark II camera can shoot at up to 18fps with continuous autofocusing and metering.
To test this out, I hand-held the E-M1 Mark II and the 12-100mm f/4 lens, and then recorded an eagle that was flying towards me. Nothing else was used to support the camera, and the weather was frankly terrible (raining and overcast), yet the E-M1 II managed to nail the focus on the majority of frames.
Here's a video showing the 45 still shots that I took, played back at a very slow frame rate so that you can judge more clearly if the eagle is in focus or not.